It’s just March, but Virginia Railway Express and MARC passengers may see some delays as the unseasonable heat forces trains to slow down during the afternoon commute. The Capital Weather Gang says records may be broken today. Temperatures may reach the mid-80s.

VRE officials, said CSX, which owns the rail used by Fredericksburg Line trains, has issued heat orders for Thursday from 1 p.m. to 7 p.m.

The Maryland Transit Administration said some of its Maryland Area Regional Commuter trains would also operate under restrictions. Those tracks are also owned by CSX. Brunswick and Camden line paseengers may see delays of five to 15 minutes, officials said.

During heat restrictions, trains must reduce their speeds by 20 mph. VRE said customers may experience delays from 2 to 10 minutes.

Trains must slow during the heat because the steel rails may expand. The expansion can case a shift in track.